[DiogenesLamp]

About 95% of the items people draw attention to would have logically been created in 1961 when the original document was prepared. About 2% involve artifacts in the "image" introduced at the time everything was photographed for transfer into what was probably a microfiche system (then popular with government offices who had large file storage and retrieval problems ~ they really cut the cost).

Have you seen the articles regarding the different fonts of different letters? (comparisons of each letter with it's subsequent use in the document) It looks like 20 different typewriters were used to create that document. The difference is most noticeable regarding the letter "t", where the letter is so distinctly different from one iteration to another that it simply cannot be argued they were typed on the same type writer. The fonts are completely and significantly different.

I'll see if I can find that article for you.

[muawiyah]

Yes, I've seen that article. It proved little more than that at least one of the machines (typewriters) was used in a dusty environment and that the ribbon hadn't been changed recently.

Those old cloth ribbons had their own problems.

You could analyze the heck out of the typeface information and arrive at only one conclusion ~ two typewriters were used at different times in the production of the original document BUT they had their tabs set identically. I suspect they were made by different typewriter manufacturers but I don't know. Someone needs to hustle up their grandfather who used to repair typewriters for a living ~ see what he says.